Since a few days we are not able to add pstn gateways' to the PSTN GatewayList during within Set-CsOnlineVoice Route cmdlet.
We add the Gateway on the customer tenant within the Direct Routing Carrier Processing.
Are there any issues in the Backend?
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@arink82 Hey, with these kind of issues you should go through the official MS support (as this is the first answer and a week has gone). Hope its been sorted!